Saw retoothing machine



' April 11, 1950 M. H. WILBERT 2,503,980

SAW RETOOTHING MACHINE Filed Aug. 23, 1947 2 Sheets-Sheet l 7 April 1950 M. H. WILBERT 2,503,980

SAW RETOOTHING MACHINE Filed Aug. 23, 1947 2 Sheets-Sheet 2 Iwveniar Wm. WM

Patented Apr. 11, 1950 UNITED STATES r OFFICE Claims.

The object of my invention is to improve and simplify my Saw retoothing machine, Patent 2,300,717, by making new disposal of various parts as used therein, and using an entirely new and novel means for attaining vital manipulations so as to both simplify and contribute to the accuracy of the device.

A further object of my invention is to provide a device of the type described, which is simple to construct, compact in shape and efficient and accurate in the purpose intended.

Other objects and advantages will appear as the specification proceeds andthe novel features of the invention will be particularly set forth in the appended claims.

My invention is illustrated in the accompanying drawings forming part of this application, in which:

Figure 1 is a top view of machine as drawn and described in Patent 2,300,717.

Figure 2 is a top view of traveling head and means of moving same.

Figure 3 is a front view of traveling head.

Figure 4 is a cross section through traveling head at D disclosing working parts in relief.

While I have shown only a simplified form of my invention, it should be understood that various changes or modifications may be made so as to use it as a hand operated device or to convert it to more complicated forms as necessary for air or hydraulic controls and appurtenances, within the scope of the appended claims and Without departing from the spirit of the invention.

In carrying out my invention, I provide a frame indicat d en rally at A, Fig. l, which consists of end castings I and 2 resting on a base 3 with cylindrical guide bars, either solid or tube, designated 4 and 5 extending between and sup-- ported-by the end castings i and 2.

A sliding head 13 moves freely along the guide bars 4 and 5.

I provide an entirely new and novel means for stepwise advancing the head B along the guide bars 4 and 5 and designatethe means for achieving this result as a cram'p follower feed.

Within a head II which slides freely on guide bar 4 are two hardened flat washers with sharp edges l2, bored to a free fit on rod 4 and of a thickness which enables them to set side by side in the head and still leave space for a resilient material 3? or springs, between their outside faces and the inner faces of the head H; the back of the inside of head is recessed to receive the rear edges of the washers and hold them together at the rear, while the front edges of the washers are free to move apart and may be spread so that they cramp on the guide bar 4 and have a lock grip on the bar; the spread of the washers is accomplished by a spreader pin which has a conical point l3 and this point will pry the washers apart and hold them apart; as long as this pin is holding the Washers apart they are firmly locked to the bar 4 and as soon as pin is released a spring [4 which engages the filli ter head of the pin, retracts the pin and frees the washers and the resilient material forces the washers into a parallel contact with each other, and they are now entirely free to slide on the bars.

A threaded sleeve [5 bored for a free sliding fit on bar 4 and fine threaded into head B along the line of bore for guide rods, makes it possible to open or close a space between the inner face of this sleeve and the face of the cramp follower head i l; inserted pins l6 together with compression springs H in the sliding head boss which adjoins the opposite face of the cramp follower head H causes the follower head to fair up to the face of the threaded sleeve 15 and normally holds it there; with head I l in this position, pressure may be applied to spreader pin I3 lockin the head i l to guide bar 4 by grip of the cramp washers l2, and the head ll becomes a fixture, to pry against, for moving the carrier one step along the guide rods; this forward movement of the sliding head continues until the rear boss is up against the follower head which new acts as a stop and the sliding head will have moved a distance equal to the space set by the threaded sleeve when the pressure is removed from the spreader pin l3 the pins 16 thru action of springs l i will advance the follower head into its normal position against the face of the threaded sleeve or stop. a

While there are many ways to apply pressure to the pin 53 for advancing the sliding head along the guide bars, such as air or hydraulic pistons or more simply by means of cams and levers I will show a simple mechanical lever and cam means for accomplishing these results; on the pin end of head H and on opposite horizontal sides, two cams is are eccentrically mounted by means of studs which protrude from cams and set into recesses in the head H see Figure 2; a cramping head !9 swingsover the head end being mounted on the cams and swinging on the cam studs as pivots; square studs protrude from the opposite faces of the cams and directly opposite the pivot studs and these square studs engage the fork of a lever 20 in such a way that swinging the lever rotates the cams and rotating the cams will draw the cramping head towards or move it away from the head H; a hollow head set screw 2| is centrally located in the body of the cramping head l9 and in the cupped end of set screw a steel ball 22 rides and seats in a conical center in the fillister head of pin [3, thus allowing the cramping head ill to pivot freely on the ball hearin as the cams rock the arms of the cramping head I9; this set screw 2| provides adjustment for setting proper throw in end of the cramping head IS the pin [3 will give the proper degree of cramp to the washers 12 to lock the head II on the bar 4-; then as the lever.

28 is swung still further it will engage one end of a lever pawl 2t which is pivotally mcu'ntedin a bracket formed on the head boss, into which the threaded sleeve is fitted; the other end of the pawllever engages the. cramp follower. H and acts to pry the; sliding headB along the guide bars i: and 5.

Asthe-lever Ell swings'to'extremeback position it releases the spread pin !3 from the cramp washers l2 and allows the head F'to move freely on guide bar l-the inserted pins 16 and springs I! will now act to move the-head H up against the adjusting sleeve l -and the reaction of the pins and springs :will tend to move the sliding head B in a-countermovement; to prevent this reaction L employ awheadlock washer 23 at rear endof the headboss; thiscramp washer 23 is held cramped to the guide bar lbya tension spring 25 and theback of washer rides swingably on apedestal fixedto 'the'rear of boss; this I head lock washer: 23 positively lockshead B against reverse motion. and so when itbecomes necessary toset sliding *headB back'to a starting positionit becomes necessary. to relieve the cramp washer'23; this is accomplished by a head release camrz l mounted at rearend-of head boss andwh'ich will engage the head lock .washer 23 andhold itparallel to the face ofthe boss so that it willnowslide'freely on theguide bar 4.

Without further elaboration, this disclosure will so fully reveal the gist of the improvements, that othersrcan by applying current knowledge, readily vary these improvements without omitting certain features, that from the standpoint of the prior art, fairly constitute essential characteristics of the specific and. generic aspects of the improvements and'therefore such variations are intended to be comprehended within the meaning and'range-of equivalency of the following claims.

I claim:

1. In a saw retoothing' machine having a frame, using parallel guide bars and an adjustable tooth punch, a sliding head on which a punch is mounted, with athreaddsleeve' fitted to the front boss of thesliding headandfunctioning' to set the amount of stepwise advance, with a bracket'attached tofrontboss which has a forked end, enabling: a lever pawl to bepivoted" and swung, for-moving the-sliding head along the guide bars; with a-headlock washer for checking any reverse motion ofhead, with a cam release for the head lock washer and a cramp follower which acts to furnish the stepwise advance, acting both as afulcrum and a reference point, from which anymcvemcnt, imparted to the sliding head, maybe controlled:

- 2. The;device-asasetrforth inclaim-l, inwhich a cramp follower feed is means for stepwise advancing the sliding head, and consists of a hollow head, which is bored crosswise for a free fit to the guide rod on which it travels or looks, and within this hollow head are two finished and hardened washers, which are also a free fit on the guide bar, at such times as they lie in full'contact with each other and these washers are fitted neatly into a slot recess at rear of the follower head chamber soas to prevent any spread apart at this point, this recess serving further, to anchor the follower when the washers are locked to the guide bar, and a square end at the front of the hollow head, is-drilled to lit a spreader pin shank and counterbored to the diameter of the fillister head of the pin and to a depth sufiicient to contain a retracting spring, .and a spreader pin, with a fillister head and a conical point, the head having aconical recess in the center to act as a seat for a steel ball bearing while the point of the pin is. centrallylocatedand directed to engage the contacting edgesof the two washers so as to wedge them apart, and a resilient material or steel springs between the outside-faces of the washers and the inside faces of:the head chamber, providing an agent that holds the washers together fiatwise except when pressure is applied to the spreader pin, to wedgethe washers'apart' at their front edges, and cause them to cramp and lock to theguide-bar, and in turn locking the follower head to the guide bar, and thus furnishing a fulcrum point for pryingthe sliding head forward, in. stepwise advance, and also creating 3, referencepoint, from. which theislidinghead can be moved an exact distance.

3. The deviceasset forth in" claim 1, in which a headlock washer supported at its rear edge'hya pedestal bracket, attached to the rear of the sliding head, and pulled towards the head by a pair of balanced springs, which act at opposite sides and to the front of washer, so as to hold washer cramped to guide bar, locking the sliding head against any backwardmotion but freely following the forward advance of the head and which headlock Washer may be rendered inactive, during such periods as it is desired to move the sliding head back to a starting point, by means of a knurled headed cam, set in the stepmount at rear of sliding head and in such a position that rotating the cam will lift the washer" and holdit parallel to the faceof head, in which position it will slide freely in both .directions along the guide bars.

4. The device as set forth in claim 1, in which a sleeve, cut 32 threads to the inch on its outerdiameter which makes it advance 1,; inch per turn, having a hexagon head for turning and calibrating, is threaded into the forward bossof the sliding head and varies the gap between its inner face and the adjoining'face of the cramp follower feed when the sliding head is faired up to the. rear face ofthe followenheadand .sincethis gap will represent the stepwise advance of the sliding'head, it will bethe measurebf'the-size of tooth tobe out insaw.

5.. In. arsaw retoothingmachine having a; carrier frame and anadjustable-tooth punch, a-slidlug-head freely mountedon guide bars-in t carrierframe; and acramp follower feed-that is operated by means of "cams. andlevers, in which a square end of follower head to serve as bearings forthe studs and a hollow head set screw centrally located in the body of the cramping head Which contacts a ball bearing seated in the conical recess in the head ofjaa spreader pin, with a lillister head and a conical point and which serves to spread the cramp'washers and thus lock the follower head against'sliding so that as the cams are rotated by the forked lever, they will rock the cramping head on the ball bearing and pull it down against, or upward to release, the spreader pin, so that when the lever is moved to a position straight out over the cramping head, the maximum throw is given? to the pin and the cramp washers are locked to the; guide bar, thus rock ing the follower head, sO' that lever can be further oriented to contact the lever pawl which; using the follower head as a fulcrum. will pry the sliding head and stepwise-advance it the width of thegap, set by the threaded sleeve, and when lever is returned to its starting position, then the follower head is free to move and the thrust of 6 the recessed pins and springs behind it, will fair the follower head up to the threaded sleeve thus closing the gap and also a headlock washer to prevent any reverse motion to the sliding head as it progresses along in its stepwise advance, a release cam to nullify the headlock washer when it is desirable to move the head in a backward direction, a threaded sleeve, calibrated for different widths of gaps conforming to different sized teeth in a saw, inserted springs and pins to set the follower head up to the threaded gage sleeve, when the cramp washers are unlocked and free movement restored to the follower head.

MARTIN H. WILBERT.

REFERENCES CITED UNITED STATES PATENTS Name Date Wilbert Nov. 3, 1942 Number 

